What is dark matter? by atiliog

science · @atiliog · Dec 1 '16 (edited)

What is dark matter?

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<p><img src="http://img.rtve.es/v/3239830/"/></p>
<p>In astrophysics and physical cosmology, dark matter is considered a type of matter which corresponds to 27% of the energy-matter of the universe, which is not dark energy, ordinary matter, nor neutrinos.</p>
<p>Some observations have indicated the existence of dark matter in the universe, such as the speed at which galaxies rotate, the gravitational lenses of background objects, or how the hot gas temperature is distributed by galaxies. The current theory is that all galaxies exist within a large cluster of dark matter. Its existence can be deduced from its gravitational effects on visible matter, such as stars or galaxies, as well as on the anisotropies of the cosmic microwave background present in the universe. However, its composition remains as a mystery to this day.</p>
<p>It’s called so because it does not emit any type of electromagnetic radiation (such as light). In fact, it does not interact in any way with electromagnetic radiation, being completely transparent throughout the electromagnetic spectrum.</p>
<p>An experiment confirms that it has been detected dark matter in the proximities of our planet, however; some scientists think that this is wrong. What is clear is that for the moment dark matter cannot be seen even with the largest telescope in the world, and will remain as an interrogative for years.&nbsp;</p>
<p><img src="https://www.zonageek.net/wp-content/uploads/2016/03/Dark-matter.jpg" width="1024" height="768"/></p>
<h1>Why could be important the dark matter?</h1>
<p>If there is not enough dark matter to gravitationally bind to the Universe (i.e. if the<strong> </strong><a href="https://en.wikipedia.org/wiki/Cosmological_constant#.CE.A9.CE.9B_.28Omega_Lambda.29"><strong>Omega</strong></a> value is less than 1), it could continue to expand infinitely. On the other hand, if there is enough mass (that is, if the <a href="https://en.wikipedia.org/wiki/Cosmological_constant#.CE.A9.CE.9B_.28Omega_Lambda.29"><strong>Omega</strong></a> value is greater than 1), the Universe could finally slow its expansion, stop it and start contracting, eventually collapse.</p>
<h3><strong>Note that "</strong><a href="https://en.wikipedia.org/wiki/Cosmological_constant#.CE.A9.CE.9B_.28Omega_Lambda.29"><strong>Omega</strong></a><strong>" is a term that cosmologists use to refer to the full mass of the Universe.</strong></h3>
<p>Since the totality of visible matter is only a small fraction of the total mass of the Universe, knowing the exact amount of dark matter with some accuracy could help us to determine its evolutionary future.&nbsp;</p>
<p>Thanks to important technological advances, both in the astronomical instruments available and in the power of the computers dedicated to astrophysical research, the coincidence of the observational results with the theoretical investigations has become not only possible, but crucial for the progress in the resolution of the mystery of the dark matter, one of the keys to discover the origin, the evolution and the destiny of our Universe.</p>
<p><img src="http://2.bp.blogspot.com/-w6j2BOHPxcE/UyCJpa_68kI/AAAAAAAAA9w/w2lCCJeNJDE/s1600/-cosmos-533x329.jpg" width="533" height="329"/></p>
<p>I wanna thanks you if you arrived here, I hope you liked my post, you can give upvote if so. Let me a comment with your opinion about it or giving me a suggestion of how could I do it better in the next ones. &nbsp;</p>
<h2>Image sources:&nbsp;</h2>
<p>First image: <a href="http://img.rtve.es/v/3239830/">http://img.rtve.es/v/3239830/</a></p>
<p>Second image: <a href="https://www.zonageek.net/wp-content/uploads/2016/03/Dark-matter.jpg">https://www.zonageek.net/wp-content/uploads/2016/03/Dark-matter.jpg</a></p>
<p>Third image: <a href="http://2.bp.blogspot.com/-w6j2BOHPxcE/UyCJpa_68kI/AAAAAAAAA9w/w2lCCJeNJDE/s1600/-cosmos-533x329.jpg">http://2.bp.blogspot.com/-w6j2BOHPxcE/UyCJpa_68kI/AAAAAAAAA9w/w2lCCJeNJDE/s1600/-cosmos-533x329.jpg</a></p>
<p><br></p>
</html>

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@lemouth · Nov 30 '16 (edited)

That's a nice post about dark matter. You may want to give some references from where you get this information. Not citing his/her source is not fair with respect to the author of the original place you found the information.

In particular could you please comment this part:
> An experiment confirms that it has been detected dark matter in the proximities of our planet, however; some scientists think that this is wrong. 

I have not heard anything about that... There is so far no hint for dark matter in any experiment. Could you please specify?

Finally, a few comments, if you allow me:
 * Why introducing 'Omega'. Introducing a symbol without defining what is the physics behind is maybe not good for communicating with the general audience :)
 * Neutrinos are considered as ordinary matter. 
 * Dark matter is not only astrophysics. It is actually mainly connected to cosmology, and also related to collider physics by the way.

For more information on how we look for dark matter, you may want to check my [hitchhiker guide](https://steemit.com/science/@lemouth/a-hitchhiker-guide-to-the-quest-for-dark-matter) :)

👍 steemcleaners, anarchyhasnogods, atiliog

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@atiliog · Nov 30 '16

Hey thanks for your comment! I apologize because I'm fairly new to Steemit and I tend to commit some mistakes.

About the experiments I talked about, here you have a link: https://www.nasa.gov/feature/jpl/earth-might-have-hairy-dark-matter (I know I should have put some references, sorry)

About the "Omega" if you look, I linked the word to the Wikipedia, in case someone didn't know what does it mean, but I think I should have explained in the post

Well, about Neutrinos, you're right here, I have nothing to say...

And yes, you're right here too, I knew that but I should have specified or write something about that, or at least put in the tags

Again thank you for your comment, I'll try to be better in the next ones. By the way, your post looks interesting, I'll check it later :)

👍 jesuke

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@lemouth · Dec 1 '16

Hi,

You can still edit your post and modify, add and remove stuff accordingly (which would make it more accurate :) )

Concerning the experiments, this is not an experiment at all. It is actually a model proposal based on some observation. One model among many. There is no evidence for that model to be neither correct, nor wrong. Only future will tell us.

Concerning the omega stuff, the wikipedia page is after all, a wikipedia page... :) And it is very long. Maybe could you replace it by one or two lines of information (that will make the life of the reader easier).

And to conclude, do not hesitate to pass by the steemSTEM channel on the Steemit chat and say hi :)

👍 atiliog

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@anarchyhasnogods · Nov 30 '16

Interesting post! I also love writing about science! When I first started out my posts were really bad, and it took me a few weeks to work up to something of this good quality! I've found out one of the best strategies for writing a (science) post is having somebody look over it before you post it. 
Also, one of the most important things about writing in science is to make sure to give sources to where you got the information. This helps with anybody who wants to make posts about the topic in the future (and helps prevent false information but yours is all correct :)  ).

👍 anarchyhasnogods, atiliog

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@atiliog · Nov 30 '16

Hey thanks for your comment, I appreciate all the support :)!

👍 anarchyhasnogods, jesuke

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@steemstem · Dec 1 '16

https://img1.steemit.com/0x0/http://oi63.tinypic.com/20ky92v.jpg

You should join us in the steemstem chat channel! This channel is dedicated to helping people make the best posts possible and to talk about science! We are excited to see your future posts! 
Dark matter is a complex subject and many people get the wrong idea about it. Great job breaking it down for the common reader!
https://steemit.chat/channel/steemSTEM

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@mindunleashed · Jul 3 '17

Omega fa shoga. Thanks for sharing!
Also check out the @mindunleashed 🐣

👍 mindunleashed

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